[AMPS] Question on reforming caps NCL2000

[Rich Measures]

>
>
>On Fri, 11 Sep 98 08:20:52 -0800 Rich Measures <measures@vc.net> writes:
>>
>>
>>The designers rather obviously did not bother to read the RCA 
>>Transmitting Tube Manual.  In stock config., the amp. is potentially 
>>an 
>>8122-screen-assassinator.
>
>
>No argument...what was designed was not what Mike Ferber ( National
>Marketing VP) forced on the market.
>
>
>
> > If you are interested, I can mail you a copy 
>> of a schematic with needed changes.
>
>I tried them...they dont work. 

You tried the RCA Transmitting Tube Manual recommended cathode feedback 
resistors and they don't work? . .  You tried a shunt screen regulator to 
protect the delicate 8w screens and it does not work?.  You tried the 
simplified grid bias circuit that eliminates delicate parts and it 
doesn't work either?.  

>If you have recent upgrades I would also appreciate a copy.
>
>>  With some changes and run in AB1 instead if AB2, the NCL-2000 is clean 
enough to 
>>avoid being tarred and feathered at the next DX convention. 

>
>It takes nothing except resetting the bias AND watching the grid meter to
>make the NCL an almost clean amp with -28dB 3rd IMD 

Agreed, Carl.   Another method of assuring that no grid current flows 
would make it easier on the eyes.  .  The RCA xmtting tube manual tells 
how to make AB1 operation with the 8122 even mo' betta.  

> even with the
>unregulated screen supply. Adapting the G3SEK screen regulator 

Is this a shunt regulator?
-  later


Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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